George Zimmerman in Custody After Gun Incident

George Zimmerman is being questioned by police after a domestic incident with his wife and father-in-law that may have involved a gun, according to police.

Zimmerman is being held at the home of a relative after the incident, which involved his wife, Shellie, and her father, Colin Morgan, police in Lake Mary, Fla., told ABC News. Police are investigating whether a gun found at the scene was used in the incident.

"There was some kind of a domestic, we know that with his wife and father-in-law. Apparently there were some weapons involved and threats," the deputy police chief in Lake Mary told ABC News.

Her attorney told ABC News that Zimmerman pulled a knife on her today after she discovered a firearm in the house they shared. He then pulled a gun on his wife and her father after a verbal altercation, according to attorney Kelly Sims.

George Zimmerman's attorney, Mark O'Mara, did not immediately respond to request for comment.

Zimmerman was acquitted in July in the death of 17-year-old Trayvon Martin.

After announcing plans to divorce him earlier this month, Shellie told ABC News in an exclusive interview on Friday that George was at times verbally abusive and hurt her "emotionally, but never physical" during their marriage. She also said she believes the not guilty verdict has left her husband feeling "invincible" and since then has been "making some reckless decisions."

"I think I'm realizing that I have been married to a person for almost seven years, and I don't think that I ever really knew him at all," she said.

Shellie said that she had stood by her husband throughout the ordeal that began on Feb. 26, 2012, when he shot and killed the unarmed teenager and came to an end when a Florida jury acquitted him of murder this summer.

But less than two months later, she filed for divorce.

"I stood by my husband through everything and I kind of feel like he left me with a bunch of broken glass that I'm supposed to now assemble and make a life. ... It's just heartbreaking," Shellie said.

"I have a selfish husband. And I think George is all about George," she said.

George Zimmerman's legal team declined to comment on the divorce proceedings.

This story is developing. Check back to ABC News for more updates soon.